Heat exchanger

Abstract

A heat exchanger includes a primary chamber for a primary medium and a secondary chamber for a secondary medium. A gas-tight heat-conducting wall separates the chambers from one another. An outer jacket sheet is disposed at a distance from the wall and defines the secondary chamber along with the wall. A profiled sheet is disposed between the wall and the outer jacket sheet and subdivides the secondary chamber into an inner partial chamber and an outer partial chamber.

We claim: 
     
       1. A heat exchanger, comprising a primary chamber for a primary medium, a secondary chamber for a secondary medium, a gas-tight heat-conducting wall separating said chambers from one another, an outer jacket sheet being disposed at a distance from said wall and defining said secondary chamber along with sad wall, and a profiled sheet being disposed between said wall and said outer jacket sheet and subdividing said secondary chamber into an inner annular chamber and an outer annular chamber, said profiled sheet having a secured upper portion and hanging freely downward between said wall and said outer jacket sheet. 
     
     
       2. The heat exchanger according to claim 1, wherein said profiled sheet extends in flow direction of the primary medium and is profiled in a plane at right angles to the flow direction of the primary medium. 
     
     
       3. The heat exchanger according to claim 1, wherein said profiled sheet alternatingly touches said wall and said outer jacket sheet, forming compartmented partial chambers in said inner and outer partial chambers and maintaining said outer jacket sheet at a constant distance from said wall. 
     
     
       4. The heat exchanger according to claim 1, including an inflow line and an outflow line, said profiled sheet having two ends,   said inner and outer partial chambers being joined together and closed off from the outside at one of said ends of said profiled sheet, and   said outer partial chamber communicating with said inflow line and said inner partial chamber communicating with said outflow line at the other said ends of said profiled sheet.   
     
     
       5. The heat exchanger according to claim 4, including a bottom, said wall and said outer jacket sheet being joined in gas-tight fashion at said one end of said profiled sheet, and said one end of said profiled sheet ending at a distance from said bottom. 
     
     
       6. The heat exchanger according to claim 5, wherein said bottom is elastic. 
     
     
       7. The heat exchanger according to claim 5, including a closure sheet having sides, said closure sheet extending between said profiled sheet and said outer jacket sheet and closing said outer partial chamber at said other end of said profiled sheet; and first and second collecting conduits,   said second collecting conduit being open toward said inner partial chamber and being disposed at one of said sides of said closure sheet, said second collecting conduit communicating with said outflow line; and   said first collecting conduit being open toward said outer partial chamber and being disposed at the other of said sides of said closure sheet, and said first collecting conduit communicating with said inflow line.   
     
     
       8. The heat exchanger according to claim 7, wherein said outer jacket sheet has an outer surface, said first collecting conduit is mounted on said outer surface of said outer jacket sheet, and said outer jacket sheet has a continuous opening leading to said first collecting conduit. 
     
     
       9. The heat exchanger according to claim 7, wherein said other end of said profiled sheet is at an upper part of said profiled sheet at which said profiled sheet is secured and suspended. 
     
     
       10. The heat exchanger according to claim 1, wherein said profiled sheet has a polygonal profile. 
     
     
       11. The heat exchanger according to claim 1, wherein said profiled sheet is a corrugated sheet with a sinusoidal profile. 
     
     
       12. The heat exchanger according to claim 1, wherein at least one of said profiled and jacket sheets is formed of steel. 
     
     
       13. The heat exchanger according to claim 1, wherein at least part of said secondary chamber is formed of steel. 
     
     
       14. The heat exchanger according to claim 1, wherein said wall is formed of a relatively more expensive material for withstanding high temperatures, and said profiled sheet is formed of a relatively less expensive material. 
     
     
       15. The heat exchanger according to claim 1, wherein said wall has a side facing toward said primary chamber, and said side of said wall has pins and is tamped with a fireproof ceramic composition. 
     
     
       16. The heat exchanger according to claim 1, wherein the primary medium is a hot flue gas, and the secondary medium is a heating gas. 
     
     
       17. The heat exchanger according to claim 1, wherein the primary medium is a hot flue gas from a combustion chamber at an incineration plant, and the secondary medium is a heating gas for heating a pyrolysis reactor of an incineration plant. 
     
     
       18. A heat exchanger, comprising a gas-tight tube with a heat-conducting wall defining a primary chamber for a primary medium, a profiled sheet disposed at a distance from said tube, said profiled sheet having a secured upper portion and a free lower portion hanging freely downward, said profiled sheet together with said wall of said tube defining an inner annular chamber for a secondary medium, an outer jacket sheet disposed at a distance from said freely hanging profiled sheet, said outer jacket sheet together with said profiled sheet defining an outer annular chamber for the secondary medium, said inner and outer annular chambers communicating with one another through the secondary medium flowing past said free lower portion of said profiled sheet.